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(No Model.)

W. 1). SMITH.

BLOWER.

No. 249,802. Patented Nv. 22,1881.

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UNITED STATES 111 Price.

PATENT VVBIGHT D. SMITH, OF DETROIT, MICHIGAN, ASSIGNOR OF ONE-HALF TO MILES O. HUYETT, OF SAME PLACE.

BLOWER.

SPECIFICATION formingpart of Letters Patent No. 249,802, dated November 22, 1881.

Application filed Angnst25, 1881. (No model) To all whom it may concern:

Be it known that l, WRIGHT D. SMITH, of Detroit, in the county of" Wayne and State of Michigan, have invented an Improvement in Blowers, of which the following is a specification.

The nature of this invention relates to certain new and useful improvements in rotary blowers, by means of which a more effective service is obtained than from those of ordinary construction. This improved blower is especially adapted for use in shops for discharging outside the walls thereof sawdust, shavings, and other debris which it is desirable to remove.

The invention consists in the peculiar construction of the fan-case, by means of which the currents of air are divided and rendered more effective; also, in the peculiar construction of the fan, and in the arrangements and combinations, as are more fully hereinafter described. v

Figure l is a side elevation, with one side of the fan-case removed. Fig. 2 is a horizontal section on the line w 00 in Fig. 1. Fig. 3 is a cross-section of one of the fan-blades on line 3 y in Fig. 1.

In the accompanying di awings, which form a part of this specification, A represents the fancase, consisting of an outer scroll, A, leading into a discharge, B, and of an inner scroll, (J, starting from about the top of the opening D and leading into the discharge E.

D is an opening in one side of the fan-case, atiording communication between the interior of the case and the inlet-box F.

G is the fan-shaft, suitably journaled at each end in boxes 11, and to this shaft are secured four or more pairs ofarms, I. The arms ofeach pair are not placed directly opposite eaeh'other, but one arm of each pair is secured a little in advance of its fellow, as shown in Fig. 1, and to the rear edges of each pair of arms are secured the fans or buckets J, thus forming each fan somewhatinto the shape of a screw-bladed scoop. The fan arms'are arranged upon the shaft nearest the side opposite the opening D, in order not to impede or cut off the free inflow of air, with its accompanying debris, through such opening--a difficulty which has been largely experienced in fans for this purpose and now in general use.

I do not desire to confine myselfto four pairs of arms or four blades, as these may be indefinitely increased, as occasion may require; nor do I desire to confine myself to the two scrolls described, as with an increase in the number of arms it may be found preferable to increase the number of scrolls in like proportion.

The peculiar shape of the fan-blades enables me to carry more air with less compression, and the inner scroll, communicating with an independent outlet, relieves this compression or resistance of the air, when the fans are under a rapid motion, by affording additional outlets for such air, whereby less power is required than in fans producing alike result of an ordinary construction, while it will readily be seen that the number of the exhausts may be increased as desired.

What I claim as my invention is- 1. Acase for rotary blowers, consisting ofan inner scroll, O, and an outer scroll, A, both scrolls starting'from opposite sides of the case and ending with the outlet of said case, substantially as and for the purpose specified.

2. The case A, consisting of two scrolls, A 0, starting from opposite sides ofthe fan-chamber, and each having an independent outlet, in combination with the frame I J, substantially as and for the purpose specified.

WRIGHT 1).SMTTH.

Witnesses:

H. S. SPRAGUE, 1t. DEAcoN. 

